GB2206374A

GB2206374A - Door restraining assembly

Info

Publication number: GB2206374A
Application number: GB08715688A
Authority: GB
Inventors: David Kuo
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-07-03
Filing date: 1987-07-03
Publication date: 1989-01-05
Also published as: GB8715688D0

Abstract

This invention relates to a door restraining assembly, which is constructed to limit the opening of the door to the fully locked, partially closed and fully opened position and comprises a projecting member 1 which is installed on door and is tipped with a ball 11; a bracket 2 which is installed on the door frame, and a slot member 22 which is pivoted thereon. When the slot member 22 is engaged over the member 1 it restrains the door to a partially closed position. A lock pin 23 can be inserted into a hole 213 on bracket to hold the door closed. Furthermore, the member 1 can be released from the slot member 22 via enlarged slot region 221. <IMAGE>

Description

TITLE: A NEW DESIGN OW DOOR. LATCH ASSEMBLY This invention relates to a novel door latch assembly.

The only purpose of traditional types of door latches is to set the door in a fully locked position.

That is, the door is latched after it is closed. The major shortcoming caused by this type of door latch is the difficulty to identify the visitors outside the door. Therefore recently, a so-called partial-closed latch was used, which allows the door to be set in a partially closed position by means of a chain connected between the door and door frame thereby providing a 1 limited door opening, through which the visitors outside the door can be identified. However, these types of latc[irs are till not perfect 8eherl in practical use.

Though, these types of latches can be used to set the door in a partially closed position, they can 1ot be used to set the door in a fully locked position (such as during night time or the time people don't want to be disturbed); therefore its user has to install another type of latch to fully lock the door which may increases the cost and makes the operation of door latch more complicated. Also there is the possibility that the chain of the latch can he broken whenever someone is trying to break into the house. Therefore the safety problem is doubtful.

In view of the shortcomings of the traditional types of door latches, the inventor thought that a reasonable door latch should possess both functions of setting door fully locked and partially closed. Besides, the strength must be improved and the operation procedure must be simplified. Based on this idea, this new type of door latch is inntd.

SUMMARY OF THE INVENTION In this invention, the lirnited opening of a door is formed by the sliding of hook stopper along slot member within a limited stroke. And by inserting a lock pin into the slider bracket, the door can be fully locked. Furthermore, by arranging properly the ball at the tip of hook stopper and slot member, the door can also be set in a fully opened position. All these three functions are possessed by this invention and is a special feature of this invention. It is ore effective than that of the traditional type of door latch.More specifically, this invention is in a simple construction though it performs more functions thall those traditional type of door latches.

BRIEF DISCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of this invention.

Figure 2 is the assembly drawing which shows the practical application of this invention.

Figure 3 is a perspective view of this invention which shows a partilly opened door setting.

Figure 4 is a perspective view rcrhic! shows a fully closed door setting.

Figure 5 is a perspective view of fully opened door setting.

DETAII,ED DISCRIPTION OF THE PREFERRED EMBOIDIMENT Refereing tri figure 5, this invention comprises a hook stopper 1 and a slider bracket 2. The hook stopper 1 is made of copper (or steel) by whole unit casting.

The hook stopper has a flat lip on its bottom section, through which the hook stopper is fixed on door b screws. Starting from the middle section, the hook stopper 1 is bended to extend toward the leading end arid having a ball 11 on it tip. The slider bracket 2 comprises base 21, slot member 22, and lock pin 23 .

On bottom section of base 21 are mounting holes 211.

through which the base can be mounted and fixed by screws on door frame 4 Base 21 has to vertical walls 212 tc which the slot member 22 is pvoted.

On the upper portion of said vertical walls are a pair of locking holes 213 into wiicI-i the lock pin 23 can be inserted. Slot member 22 is also made by whole unit casting, and its leading end (open end) is a wider space 221 which allows the ball end of hook stopper to pass through. The rear portion behind the leading end is a slot to allow the hook stopper sliding alone the slot space. The slot space has a size smaller than the diameter of the ball 11. The size of lock pin 23 is selected to match the size of locking hole 213, and lock pin 23 is connected to base 21 by a chain 231.

As illustrated in figure 2, there is shown an assembly dran of this invention. The hook stopper 1 and the slider bracket 2 are fizzed on the door 3 and door frame 4 respectively. The ole unit is so arranged to have the ball 11 on the end of the hook stopper precisely located at the leading end space 221 of slot member 22. After the hook stopper . and slider bracke@ 2 are firmly fi-:ed b- s@cre@@@ the whols unit can be used to set the door in open or ioned position b pulling the slot member 22 to left or right setting positions.

Referring to figure 2 again, the right hand side setting position of slot member 22 for a partially opened door setting is shown. When the door 3 is opened, the hook stopper on the door is moved toward the closed end alona the space 222 of slot member 22, which allows the door having a small opening limited by stro of hook stopper sliding. As shown in figure 3, there is shown a partially opened door setting through the limited door opening one can safely identify the visitors. It is obvious, when the visitors outside the door try to break into the door, the hook stopper will slide toward the closed end of slot member, since the ball size is bigger the slot size, That is, the door 4 is therefore stopped at a limited position, unless the copper made (or steel made) hook stopper is broken.It is of course while in this situation the door 3 can not be opened inside the house. After tE" visitor outside the d@@r is identified, the door can be opened by pushing back the door to its fully closed portion to let the ball 11 sliding back to its leaIirig end space 221, and then pulling back the slot member 22 to the open position on left hand side to open the door.

Whenever the user wants to close the door- 3 for a longer period (for example during the sleeping time at night), he may insert the lock pin into the locking holes 213 on vertical walls 212. Since the top end of the hook stopper 1 is stopped by the lock pin 23, the hook stopper is stopped inside the slot member to lock the door (see figure 4 for example.

Besides, this invention also has a fully opened setting funtion by applying the hook stopper 1 on door 3. As illustrated in figure 5, when the door is fully opened, the ball on the end of hook stopper can be snapped by the catcher 5 on the wall keeping the door in full opened position.

Although this invention has been descri'd with a certain degree of particularity, it is understood that the present disrslosrr- is made by way of example only and that numerous changes in the detail of construction and the arrangement and combination of parts may be resorted to without departing from the scope and spirit of the invention as hereinafter claimed.

Claims

I CLAIM:

1. A door latch assembly which comprises a hook stopper made of copper or steel having a flat base lip, through the said base lip the said book stopper can be fixed on the door by screws, started from the middle section of the said book stopper, the hook stopper is bended to extend toward its leading end ad having a ball tip on said leading end, a slider bracket comprising a base, a slot member and a look pin, the said base has mounting holes on its bottom side through which tEle said base can be fixed on the door frame by screws, the said base further has two vertical walls on which the slot member is pivoted, the said vertical wall has a pair of locking holes into which the loek pin can be inserted, the said slot member has a slot at the open end of the said slot, the width of the slot. is just wide enough to allow the said ball tip to Fass through, the width of the near portion of the slot is smaller than the size of said ball, and by mounting the said hook slider bracket on door and door frame appropriately by screws, the said door latch assembly can set door in fully locked position and partially opened position.

2. A door latch assembly comprising first and second interengageable parts having a base and a slide for releasably captivating the other part, the slide being.

pivotally mounted on the base so that said other part moves along said slide as the door is opened, the slide having a stop which limits movement of said other part and thereby limits opening movement of the door, and catch means for securing the slide against pivotal movement relative to the base in the closed position of the door, so as to catch the door in the closed position.

2. A door latch assembly comprising first and second interengageable parts having a base and a slide for releasably captivating the other part, the slide being pivotally mounted on the base so that said other part moves along said slide as the door is opened, the slide having a stop which limits movement of said other part and thereby limits opening movement of the door, and catch means for securing the slide against pivotal movement relative to the base in the closed position of the door, so as to catch the door in the closed position.

Amendments to the claims have been filed as follows I CLAIM:

1. A door latch assembly which comprised a stopper made of copper or steel having a flat base lip, through the said base lip the said hook stopper can be fixed on the door by screws started from the middle section of the said hook stopper, the hook stopper is bended tn etend toward its leading end and having a hall ip on said leading end, a slider bracket comprising a base, a sjct member and a luck pin, the said base has mounting holes on its bottom side through which the said base can be fixed on the duc'r frame by screxis, the said base further hre t@@ vertical walls on which the sl@t member is pivoted, the said vertical wall has a pair cf locking holes into which the lock pin can be inserted, the said slot member has a slot at the open end of the said slot, the width of the slot is just wide enough to allow the said ball tip to pass through, the width of the near portion of the slot is smaller than the size of said ball, and by mounting the said hook slider bracket on door and door frame appropriately by screws, the said door latch assembly can set door in fully locked position and partially opened position.